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Vacuum-deposited Rb3CeI6 for deep-blue-light-emitting diodes

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Abstract

Recently, perovskite light-emitting diodes (PeLEDs) have exhibited outstanding performance in next-generation high-definition display applications. However, compared with green and red PeLEDs, the development of efficient and stable blue PeLEDs to meet the requirement for a wide color gamut has been a challenge. Herein, we vacuum thermally deposited a film of the lead-free rare earth halide Rb3CeI6, which shows deep blue emission with peaks at 427nm and 468nm. Due to the parity-allowed 5d–4f transition of Ce(III), the excited-state lifetime is as short as 22.3ns (427nm) and 25ns (468nm), respectively. The photoluminescence quantum yield (PLQY) is optimized to 51% by regulating the nucleation and growth of Rb3CeI6 grains. In a prototype rare earth light-emitting diode (ReLED) device, a thin insulating Al2O3 layer (5nm) is inserted between the electron transport layer (ETL) and the emitting layer (EML, Rb3CeI6) to balance the carriers and reduce the dark current. The device shows a maximum luminance and EQE of 98 cd m−2 and 0.67%, respectively, and the electroluminescence (EL) spectrum maintains stability with changes in the operating voltage. In addition, the corresponding CIE coordinate is (0.15, 0.06), which closely matches the Rec. 2020 standard (0.131, 0.046).

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Supplementary Material (1)

NameDescription
Supplement 1       The supplemental document describes the details of Rb3CeI6 film and ReLEDs device preparations, exhibits supplementary characterization on the elementary compositions and morphologies of Rb3CeI6 film (SEM, ICP, XPS) and ReLEDs device (AFM), further a

Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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